{"id":"CVE-2026-50055","title":"A policy-enforcement flaw in Zimbra Collaboration Suite allows an authenticated user to bypass disabled mail forwarding by using a Sieve notify action to send copies of email content and headers to an arbitrary address.","summary":"A policy-enforcement flaw in Zimbra Collaboration Suite allows an authenticated user to bypass disabled mail forwarding by using a Sieve notify action to send copies of email content and headers to an arbitrary address.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-863"],"vendor":"Zimbra","product":"Zimbra Collaboration Suite","affected":["collaboration_suite < 10.1.20"],"published":"2026-10-08","updated":"2026-10-08","sourceUpdated":"2026-10-08T20:49:23.240","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50055","references":[{"url":"https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories","label":"cve@rapid7.com"}],"tags":["nvd","exploit-available","cve.org"],"exploits":{"github":1,"githubRepos":["https://github.com/HORKimhab/CVE-2026-50055"],"checkedAt":"2026-10-08T21:08:32.538Z"},"exploitAvailable":true,"ingestedAt":"2026-10-08T16:52:14.786Z","slug":"CVE-2026-50055","body":"## Overview\n\nA policy-enforcement flaw in Zimbra Collaboration Suite allows an authenticated user to bypass disabled mail forwarding by using a Sieve notify action to send copies of email content and headers to an arbitrary address.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}